"Online ads are the fuel that powers the unlimited expressions and presentations of free speech on the open internet," said Dave Grimaldi, executive VP of public policy for the Interactive Advertising Bureau. "Growing the vibrant media ecosystem, keeping the public trust, and enhancing the transparency of our industry – for online ads in particular – are goals we share with Senators Klobuchar and Warner. We look forward to working with them to advance this shared objective while maintaining and protecting the First Amendment rights political ads embody."

A spokesman for Warner's office said the bill would not be introduced Thursday (Oct. 5), as some had speculated, and that the draft had changed since a letter was sent seeking co-sponsors last month.